ASTRO: First go at m27

My first go at M27, what do you think?

Paul

On 9/17/2010 11:55 AM, Paul wrote:
My first go at M27, what do you think?

Paul

These remind me of my first attempts back in the 50's. With film I'd
not know if I was in focus until the next day when I developed the film.
Usually it was, like yours, severely out of focus so I saw nothing but
small donuts for stars.

Today there are easy cures for this problem. Make or buy a Bahtinov
mask for your scope (Google the term). Then you can get accurate focus
every time. Just take a quick test photo of a bright star, The pattern
tells you how far and in which direction o move the focus. Adjust until
the pattern shows you are dead on focus. Then go back to your target
and image knowing you are in perfect focus. Temperature change will
often require refocusing every 20 minutes or so depending on telescope
design.

Rick

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Third character is a zero rather than a capital "Oh".